Re: GAS-L: Internal Combustion with Producer Gas

[Prof P P Parikh <parikh@me.iitb.ernet.in>]

Sorry there are some corrections in the passage below -- typographical
errors!! 

READ IT AS BELOW: THE CAPITAL WORDS/LETTERS ARE THE CORRECTIONS:

> 
> Mr. Peter Singfield and all
> 
> Thanks for your mail. When a pilot spray is used there are reasons for
> NOT knocking even at high compression ratios because 
> (a) diesel ENGINE by itself has a lot of excess air provision 
> (b) due to pilot spray the amount of energy input through gas is only
>     about 75-80% (generally). 
> 
> Due to these two factors the pre-mixed mixture is extremely lean. Moreover
> ignition from pilot spray would mean multi-point ignition and hence much
> reduced maximum flame travel. All these factors counter the knocking
> tendency. All the same even in dual-fuel engine knocking has been reported
> at high loads and low pilot spray quantities. In fact dual-fuel operation
> gets bracketed between the lean misfire limit and the rich knocking limit
> (which also is in fact lean). This means there is a bracket to the minimum
> and maximum load for which dual-fuel operation can be carried out. An
> extension to this logic is that even 17 as a compression ratio can be used
> but the richness of the pre-mixed mixture need to be limited thereby
> limiting the max load for load-fuel operation. I hope this clarifies what
> I mentioned in my previous mail.
> 
> Prof. Parikh
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Prof. (Mrs.) P.P.Parikh          Phone  Office : 5723496, 5767548 
> Dept. of Mechanical Engg.                        5722545 Ext. 7548 / 8385 
> I.I.T. Bombay				Home   : 5704646 	
> Mumbai 400 076 INDIA		 Fax	Office : 5723496, 5723480
> 		
>                     email : parikh@me.iitb.ernet.in    			   
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> On Thu, 4 May 2000, Peter Singfield wrote:
> 
> > Thank you Mrs Parikh;
> > 
> > I quoted you poorly. You had mentioned 12:1 at the best upper level due to
> > knocking beyond that range. Thank you for supplying the upper limit -- 14/15:1
> > 
> > Wish I was at your facilities in India -- I am sure with a little fine
> > tuning -- that can be over come -- and for an economic investment.
> > 
> > >Even other wise over a period of operation
> > >deposits could be formed bue to lub-oil burning.
> > 
> > Yes -- possible -- but then consider -- it doesn't happen when using diesel
> > fuel injection ignition!
> > 
> > When one considers this -- ????
> > 
> > 
> > Peter Singfield
> > COROGEN
> > Executive Director
> > Xaibe Village
> > Corozal District
> > Belize, Central America
> > Tel 501-4-35213
> > E-mail: snkm@btl.net
> > 
> > 
> > At 03:07 PM 5/4/00 +0530, you wrote:
> > >Spark ignition engines definitely knock at compression ratios beyond
> > >14/15. May be deposits formed due to contaminants provide preignition
> > >spots and cause knocking! Even other wise over a period of operation
> > >deposits could be formed bue to lub-oil burning. The fact is the engine
> > >knocks!
> > >Mrs Parikh
> > >
> > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ~~~~
> > >Prof. (Mrs.) P.P.Parikh          Phone  Office : 5723496, 5767548 
> > >Dept. of Mechanical Engg.                        5722545 Ext. 7548 / 8385 
> > >I.I.T. Bombay				Home   : 5704646 	
> > >Mumbai 400 076 INDIA		 Fax	Office : 5723496, 5723480
> > >		
> > >                    email : parikh@me.iitb.ernet.in    			   
> > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > >
> > >On Wed, 3 May 2000, Peter Singfield wrote:
> > >
> > >> Tom;
> > >> 
> > >> Bare with me here -- 
> > 
> > snipped*********************
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